Track-accessing controller for optical disks

Details Track-accessing controller for optical disks Track-accessing controller for optical disks

1990-02-28

1993-03-09

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4428, 369 4434, G11B 700

Patent

active

051930811

ABSTRACT:
Disclosed is an optical disk apparatus applied to a data writing/reproducing operation of a sample-servo formatted optical disk having a clock pit and two wobbled pits in each of servo regions. A photodetector receives reflected light of a light beam from the optical disk to produce a reflected light signal. A clock detection unit detects a change in intensity of reflected light components from the clock pit in response to the reflected light signal to produce a binary clock pit detection signal. A tracking error detection unit detects a change in peak intensity of reflected light components from the wobbled pits in each servo region in response to the reflected light signal to produce a binary tracking error signal representing the detected intensity difference. A determination unit is connected to the clock detection unit and the tracking error detection unit. The determination unit compares a phase of a clock pit detection signal with that of a tracking error signal to determine a crossing direction of a beam spot with respect to some of the tracks on the optical disk in accordance with the comparison result of the phases.

REFERENCES:
patent: 5023855 (1991-06-01), Kobayashi et al.
patent: 5063546 (1991-11-01), Ito et al.
patent: 5070492 (1991-12-01), Ogawa et al.
patent: 5073880 (1991-12-01), Maeda et al.
patent: 5099467 (1992-03-01), Sumihiro et al.

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